Bucket operating and boom swinging mechanism for concrete pavers



E. TRANAAS Oct. 31-, 1933.

BUCKET OPERATING AND BOOM SWINGING MECHANISM FOR CONCRETE PAVERS Filed Oct. 18 1929 5 Sheets-Sheet l //V VE/V 701% E'. 771272 aas. W

ATTORNEYS Oct. 31, 1933. TRANAAS 1,933,399

BUCKET OPERATING AND BOOM SWINGING MECHANISM FOR CONCRETE PAVERS Filed Oct. 18, 1929 5 Sheets-Sheet 2' I l I E I l@@@ H m I I I I I 11 M V I 54' 52 70 I/Vl/E/VTOR BY 25'. Fanaas,

ATTORNEYS Oct. 31, 1933. E. TRANAAs- 1,933,399 BUCKET OPERATING AND BOOM SWINGING' MECHANISM FOR CONCRETE PAVERS Filed Oct. 18, 1929 5 Sheets-Sheet 5 D IN YEN TOR Z. Wanda-S.

ATTORNEYS E. TRANAAS Oct. 31, 1933.

BUCKET OPERATING AND BOOM SWINGING MECHANISM FOR CONCRETE PAVERS Filed Oct. 18, 1929 5 Sheets-Sheet 4 //V VE N 703 E: Wanaafi.

J. 073mm EIIJ- 6% Q Ma ATTORNEYS Patented Oct. 31, 1933 UNITED STATES BUCKET OPERATING AND BOOM SWINGING MECHANISM FOR CONCRETE PAVERS Emil Tranaas, Milwaukee, Wis., assignor to Kochring Company, Milwaukee, Wis., a corporation Application October 18,

5 Claims.

This invention deals with the construction of what are known today in the art of concrete mixing as paving machines. These machines are designed to distribute batches of concrete upon a subgrade, or elsewhere, and usually comprise a mixing drum or means of some sort, having an associated distributing boom and bucket attachment. I

The objects of this invention are several, and include the provision of certain novel driving mechanism for operating the cable that moves the distributing bucket back and forth on the boom. Essentially speaking, this driving mechanism comprises a clutch unit having reversing clutches, and capable of imparting opposite movements to the cable that traverses the bucket on the boom.

The invention embodies also a boom swing mechanism, which is operable from the driving unit above referred to, special provisions being made for automatically maintaining the boom swing mechanism in an inactive relation to the driving unit. Instrumentalities are provided such that the reversing means of the driving unit may be readily utilized for reversibly driving the device that swings the boom horizontally, the boom swing mechanism being thereby interdependently related to the specific features of the boom drive unit.

A full understandingof the invention may be had by referring to the accompanying drawings, in which:

Figure 1 is a fragmentary side view of the portion of a concrete paving machine necessary to illustrate to show the features of the invention, the bucket for distributing the concrete being shown in dotted lines.

Figure 2 is a view looking at the parts of Figure 1 at right angles to the illustration in Figure 1, the view being practically a section through the boom looking toward the mixing drum.

Figure 3 is a plan view partly broken away, and shown in section, of the boom swing driving parts.

Figure 4 is a vertical sectional view through the worm shaft and associated parts of Figure 3.

Figure 5 is a sectional view taken on the line 5-5 in Figure 4.

Figure 6 is a sectional view on the line 6-6 of Figure 4.

Figure '7 is a substantially top plan view of the boom drive casing, having the cable driving unit mechanism associated therewith, and parts of which are shown in section.

Figures 8 and 8-A are sectional views sepa- 1929. Serial No. 400,660

rated in order to get them upon the sheet of drawing, the view of Figure 8-A really being a continuation of the left hand end of the view of Figure 8, the two views showing the clutches and gearing of the driving unit more particularly.'

Figure 9 is a sectional view taken about on the line 99 of Figure 7.

Figure 10, is a sectional view taken on the line 10--10 of Figure 7. 7

It is not necessary to describe the construction of a paving machine of the type of the invention, because such machines are well known to those versed in this art. In the drawings there are illustrated only a few of the main parts of such machine, namely: the frame 1, the mixing drum 2, a portion of the boom 3, the distributing bucket 4 shown in dotted lines, the supporting trolley 5 for such bucket 4, and the boom supporting bracket 6 on which the boom is supported to swing horizontally about the axis 7, and vertically about the axis 8. The foregoing parts are all conventional.

The invention relates primarily to the drive unit in what may be called the drive case 9, see Figure 7, and referring particularly to Figures 8 and 8-A, said case encloses a clutch and gear unit. Mounted in suitable bearings in the case 9 is the drive shaft 10. This shaft carries at its right hand end a driving pinion 11, which meshes with the driving ring gear 12 of the drum 2, so that as the drum 2 rotates, the shaft 10 will be constantly driven. The shaft 10 is a relatively long shaft, having associated therewith a clutch unit of special construction seen best in Figures 7, 8 and 9. The clutch unit comprises a shifter lever 11a, operating a shifting collar 12-a, which is engaged by the shifting yoke 11-h of the lever 11a. The lever 11--a is suitably pivoted at 13 to the case 9. The shifting collar 12-a directly engages the grooved end 14a, see Figure 8 of the sleeve 14, mounted on the shaft 10. The sleeve 14 has an inclined cam recess 15, which engages a roller 16, carried by the operating arm of a clutch band shifting lever 17. The clutch band shifting lever 17 has an offstanding arm 17a provided with a downwardly extending pin, 17-b, which engages in a bifurcation at the adjacent end of a clutch band shifting lever 18. The clutch band shifting lever 18 is pivotally mounted at 19 upon a carrier 20, which includes as a part of its structure a sector 21, keyed or otherwise secured to the shaft 10. Clutch bands 22 and 23 surround clutch drums 24 and 25, respectively, which are loosely mounted on a separate clutch shaft 30. One end of each clutch band just mentioned is attached to the carrier 20 .by a suitable pin 26 shown in Figure 9, and the other, or live end of each brake band is attached by a bolt 27 to one end of the clutch band shifting lever 18.

Under the foregoing conditions, it is notable that since. the carrier 20, including the part 21, is secured to the shaft 10 for rotation therewith in the normal constant driving of shaft 10, the members 14, 15, 16, 17,.18, 20 and 21 rotate with the shaft. The clutch drums 24 and 25 are normally idle until a drive is to be communicated through themto the cable 2'7--a that is wound around the cable drum 28, and which cable is connected to the trolley 5 by which the bucket 4 ismoved, or the drums 24 and 25 are to be activated to cause operation of the boom swinging mechanism, including the parts best shown in Figures 3 and 4 to be hereinafter referred to.

Describing the connections between the drums 24 and 25, and the cable drive drum 28; also the connections that are used to operate the boom swing sector 29, see Figure 3. Figure .8 is referred to particularly, and also Figure 7. Clutch drums 24 and 25 are mounted upon the clutch shaft 30 substantially coaxial withthe drive shaft 10 and with which shaft 30 the drum 25 has a keyed relation, whereas the drum 24 is loose relative to said shaft. The drum 24 has a sleeve 24-a equipped with a reverse gear 31 which rotates when the drum 24 is engaged by its associated clutch band 22. On the shaft 30 is keyed a direct driving gear 32, which is rotatable when the clutch band 23, associated with the clutch drum 25, is caused to cooperate with the latter, thereby causing the drum 25 to rotate with the shaft 10. The direct driving gear 32 meshes with a sliding driven gear 33, mounted upon the cable drum shaft 34, which is below and parallel to the shaft 30, and carried in suitable bearings in the clutch unit drive case. A reversing idler gear 35 is in mesh with the gear 31, and driven gear 33 for driving the gear 33 in the reverse direction. When the brake band 23 is applied to brake drum 25, brake drum 24 is driven by the gearing above set forth, but since it is free, there is nothing to hinder its rotation. The reverse is true upon application of brake band 22 to brake drum 24.

It is to be understood that the cable 2'1-a is wrapped around the drum 28 in opposite direction's, and thus said cable may have reverse movements imparted thereto by turning the drum 28 in opposite directions. When turning in one direction, the drum 28 moves the bucket 4 outwards on the boom 3, and when turning in the opposite direction, the bucket 4 is brought inwards upon the boom.

The gear 33 is loosely mounted upon the drum shaft 34, and said gear 33 has the clutch member 33--a at its right side, and the clutch member 33-b at its left side. The clutch member 33-1: is rendered effective to transmit the movement of the gear 33 to the shaft 34 by engaging said clutch member 33-a with a clutch member 36, which is fixed to the shaft 34. Looking at Figure 8, the above operation is caused by moving the gear 33 to the right, and normally the gear 33 is held, with its clutch member 33--a, engaged with the clutch member 36 by a spring 37 seen in Figure '7. The spring 37 extends around a stem, and bears at one end against a wall of the case 9, and at its opposite end against an arm 38, carried by the round shifting slide 39, which is slidable in said case 9. The shifting slide 39 has a yoke 40, which spans or embraces the gear 33, and by moving the slide 39 to the right or to the left, the gear 33 is shifted in its'relation to the clutch member 36 and the gear 41, which has a clutch member to cooperate with the clutch member 33b. In other words, looking at Figures -8 and 8-14, the bevel gear 41 is on one side of the driving gear 33, and the clutch member 36 is on the other side. The clutch member 33--a of the gear 33 coacts with the clutch member 36, and the clutch member 33b of the gear 33coacts with a' corresponding clutch member of the bevel gear 41, the purpose of which will appear shortly, as it has to do with the boom swing mechanism. The gear 41, being loose on the cable drum shaft 34, is not infiuenced when the gear 33 is driving said shaft.

When the gear 33 is moved to the bevel pinion or gear 41, the latter is driving, and the shaft 34 is stationary.

Leading down from the casing supporting the shaft 34, see Figure 8-A and Figures 1 and 4, is an approximately vertical shaft 42. This shaft 42 carries at its upper end a bevel pinion 43 meshing with the pinion 41. At its lower end the shaft 42 will be seen to be in two parts, an upper part 180 and a lower part 42a. These two parts are connected together by a friction connection shown in Figures 5 and 6, including the outer friction drum 44, and a friction lining 45, which is carried by spring pressed sectors 46, see Figure 6, the springs coacting with the friction lining 45, Y being designated 47. The sectors 46 are yieldably mounted upon a spider 48 keyed to the lower' section 42--a of the shaft 42. The purpose of the spring controlled friction connection between the shaft 42 and its section 42a, is to prevent the breakage of any parts in the event the operating bevel gear 49 at the lower end of the shaft section 42 meets with unusual or abnormal resistance to its driving action. The bevel gear 49 is keyed to the shaft section 42--a, and meshes with a similar gear 50, see Figure 4, keyed to a worm shaft 51 in a worm gear casing 52, see Figures 3 and -4. Keyed on the shaft 51 is a worm 53 which engages the toothed sector 29 carried by the near end of the boom 3, and said worm is thus adapted to turn the sector 29 and cause a horizontal swinging movement of the boom 3. The worm 53 is mounted between springs 54- on the shaft 51 for special purposes that do not form any part or phase of the present invention, and are not therefore treated further.

For the purpose of moving the gear shifting slide 39 under manual control, there is employed a foot piece 55, see Figure 2 and Figure 1, consisting of a vertically movable bar carrying a spring 56 interposed between stop 57 thereon, and the end of the lever 58 through which the bar passes. The spring 59 normally holds the lever 58 upwards at the upper limit of the movement of the foot piece 55. A rod 60 is connected to the lever 58 intermediate its ends, and the upper end of said rod is attached to a bell crank lever 61 at the lower arm of the latter.. The upper arm of the lever 61 engages the right hand end of the gear shifting slide 39, and byv lowering the foot piece 55, the slide 39 may be shifted to the left to cause the gear 33 to be similarly shifted to thereby place the boom swing mechanism into operative relation with the clutch devices drivable from the shaft 10. As shown in Figure 9, the bell crank lever 61 cooperates at its upper end directly with a horizontal lever 62, one end of which is operated by a bell crank, and the other end of which has a suitable-yoke connection (32-11 with 150 tor 29, has at its upper end a section 42-!) that directly supports'a gear 43, and is attached to the main body of the shaft by universal joint 63 shown best in- Figure 9.

The operation of this scribed:

It is assumed that the shaft 10 is constantly turning by being driven from the rotating drum 2. The operator wishes to move the bucket 4 in one direction on the boom 3. He grasps and operates the lever 11a and moves the latter in one direction. This action causes the collar 12-a to move and thereby rock the clutch band shifting invention is now delever 18. Movement of the lever 18 in one direction tightens the right hand band 23 on the drum 25 and causes the drum 25 to turn with the shaft 10. This drives the shaft 30, the gear 32, the meshing gear 33, the clutch member 36, and turns the shaft 34 in one direction to turn the cable drum 28 correspondingly. The clutch member 33 a is assumed to be interlocked with the clutch member 36 in Figure 8 in'the above operation. The cable drum is thus rotated to move the bucket 4 in one direction. Let us suppose the lever 11-a to be moved oppositely to the movement previously just mentioned. The band tightening lever 18 will be rocked, and the clutch band 22 applied to the clutch drum 24. This will cause rotation of the drum 24 from the shaft 10, rotation of the reverse gearing 24- -a, 35, and rotation of the gear 33 in a direction opposite to its previous rotation, thereby moving the bucket 4 also in an opposite direction to that just above mentioned.

The foregoing deals with the function of the transmission of motion from the drum driven shaft 10 to the cable moving or driving drum 28 for actuating the latter in opposite directions. Such a motion will control the traversing of the bucket 4 in opposite directions on the boom 3.

It is not customary to swing the boom when the bucket 4 is being moved on the boom 3. Therefore the mechanism for driving the gear 33 in opposite directions may be availed of to operate the bevel pinion or gear 41 in opposite directions, see Figure 8-A. Driving the gear 41 in opposite directions obviously operates the shaft parts 42, 42o:, 42--b, gear 49, gear 50, shaft 51, and worm 53 to swing the boom sector 29 oppositely. To accomplish the foregoing, the operator will depress the foot piece 55, move the yoke lever 62, and carry the yoke 62--a to the left, as seen in Figure 7, whereby to clutch gear 33 to the pinion 41 for the purpose of establishing the drive from the shaft 10 to the shaft 30, to the shaft 42.

Having thus described my invention, what I claim as new is:

1. In a concrete paving machine, in combination, a driving shaft, a boom. and bucket movable on said boom, a clutch shaft coaxial with the driving shaft, a cable drum shaft parallel with the clutch shaft, a cable drum on said cable drum shaft, a cable connecting said drum with the bucket, clutch means intermediate the driving shaft and the clutch shaft including clutch drums, gearing operable by said clutch drums in opposite directions and associated with the clutch shaft and the cable drum shaft, other gearing for swinging the boom operable from the above named gearing, and means for controlling the action of the clutch devices and gearing to cause opposite movements of the bucket on the boom, and to cause swinging movement of the boom.

2. In a concrete paving machine, a combined boom bucket cable actuating and boom swingin unit comprising a driving shaft, a clutch shaft and a cable drum shaft, means for constantly rotating the driving shaft comprising clutch drums, one keyed to the clutch shaft, and the other loose thereon, clutch bands rotating with the driving shaft, means to clutch said bands alternately with said clutch drums, a. gear connected with each clutchdrum, one for direct driving action, and one for reverse driving action of the cable drum shaft, gearing between the above mentioned gears and the cable drum shaft for operating the latter forwardly or reversely, and means for controlling the action of the last named gaming for effecting the forward or reverse operations of the cable drum shaft.

3. In a concrete paving machine, a combined boom'bucket cable actuating and boom swinging unit comprising a driving shaft, a clutch shaft and a cable drum shaft, means for constantly rotating the driving shaft comprising clutch drums, one keyed to the clutch shaft, and theother loose thereon, clutch bands rotating with the driving shaft, means to clutch said bands alternately with said clutch drums, a gear connected with each clutch drum, one for direct driving action, and one for reverse driving action of the cable drum shaft, gearing between the above mentioned gears and the cable drum shaft for operating the latter forwardly or reversely, and means for controlling the action of the last named gearing for effecting the forward or reverse operations of the cable drum shaft, including a shiftable gear movable relatively to the gears connected with the clutch drums, and a reverse gear cooperative between one of said clutch drum gears and said shiftable gear.

4. In a concrete paving machine, aboom bucket cable moving and boom swinging unit comprising a driving shaft, a clutch shaft and a cable drum shaft, means for constantly rotating the driving shaft comprising clutch-drums, one keyed to the clutch shaft, and the other loose thereon, clutch bands rotating with the driving shaft, means to clutch said bands alternately with said clutch drums, a gear connected with each clutch drum, one for direct driving action, and one for reverse driving action of the cable drum shaft, gearing between the above mentioned gears and the cable drum shaft for operating the latter forwardly or reversely, and means for controlling the action of the last named gearing for effecting the forward or reverse operations of the cable drum shaft, including a shiftable gear movable relatively to the gears connected with the clutch drums, and a reverse gear cooperative between one of said clutch drum gears and said shiftable gear, a boom swinging shaft and means for adjusting the shiftable gear aforesaid to disconnect it from the cable drum shaft and connect it with the boom swinging shaft.

5. In a concrete paving machine, a boom bucket cable driving and boom swinging unit comprising a driving shaft, a clutch shaft and a cable drum shaft, means for constantly rotating the driving shaft comprising clutch drums, one keyed to the clutch shaft, and the other loose thereon, clutch bands rotating with the driving shaft, means to clutch said bands alternately with said clutch drums, a gear connected with each clutch drum, one for direct driving action, and

for adjusting the shiftable gear aforesaid to disconnect it from the cable drum shaft and connect it with the boom-swinging shaft, comprising, a manually operated member, means cooperating with the manually operated member to normal ly maintain the shiftable gear operative in rela= tion to the cable drum shaft, said manually op erated member being movable to shift the shiftable gear for connecting it operatively to the boom swinging shaft.

. EMIL 'I'RANAAS. 

